Very interesting! Photo doesn't really
relay size of
fixture well other than that latest photo with the rear access knob. Old
fixture, I think 1Kw
Fresnel or less in wattage??? A photo of it's maximum lamp wattage / serial number name plate would be good.
I see no notes of a globular lamp invented for a G-22 (22mm between pin centers) type of
socket but lots of even up to 2Kw lamps with tubular lamps for medium
bi-pin. Problem is my notes do not note a incandececnt lamp available in 1-2Kw in an
incandescent version at all - all
halogen lamps in that wattage range. Granted such a lamp is probably long discontinued or the reason for the
adaptor? My notes are mostly back to about 1976 on lamps as supplemented by earlier
book lamp guides at best, (Quite a few books in supplement,) but not complete. The
globe lamp, I will have initially assumed for the
fixture, but see no indication of any globuar
incandescent lamp associated with a G-22 lamp
socket. Reason I was looking into a globular lamp was I do have in inventory a Mole Richardson #2046 8”
Fresnel on stand c. 1936’s; 2Kw G48/18
ANSI type DVF G-38 Mog.
Bi-post Lamp. If you give the serial number and model number to B&M, like Mole they might be able to give you date of manufacturer or in my case above approximate date. They might also be able to give more info on the
adaptor which might have not serial number but at least part number.
The G-22
base is from all I have seen an invention of the 1950's. Slight War in the 40's preventing innovation from the 30's in technology in catching up in the 50's. The G-22 is 7/8" between pins and
IEC #7004-75,
ANSI #C81.61-1990sheet 1-466-1 if further reserch into their date wants to be researched. Would be really interesting to see the details of the studio grade lamp
socket for the B&M
fixture. I have no notes of the era I remember of a G-22 based
Fresnel - not that I studied studio gear much. The G-22 based
Leko's in theater fixtures kind of sucked! They were a bad lamp
base design and probably why in the 60's the origional
socket type of Medium
Pre-Focus... (P-28s) was back to as my theory.
This is a very strange
adaptor given it's seemingly long center pin and un-insulated shell given most fixtures were not polorized at this
point.... Better polorization (grounding) for studio fixtures (and hot to center prong) might be indicated was more agressive for them back than, than on
stage fixtures.... but than of course I have some c.1948
Leko's where the
bench focus adjustment was right next to live conductors in doing so. Could have been just as dangerous back than in
ground to center pin and hot to shell for the studio also. Probably given the origional lamp
socket base wasn't polorized either, more on the dangerous side.